N.B. Description based on Jap-Sin II, 43.

Budeyi bian [Pu-te-i pien] 不得已辯 [辨]
By Nan Huaren 南懷仁 (Ferdinand Verbiest).
One juan. Bamboo paper, bound in European style. No date or place of publication.

The cover bears a Latin title: “Refutatio persecuto | ris Yam Quam Sien | circa res mathemati | ces | a p. Ferdin. Verbiest | S.J.”

In his preface Verbiest states that, after the great persecution of Yang Guangxian against the missioners, Adam Schall had lost the power of speech. Verbiest himself, being a newcomer to China, had been unable to defend himself and he had therefore lived in retirement. This was the occasion for him to reflect and to discover the errors of Yang Guangxian. Verbiest then points out that the calendar method of Yang Guangxian came from the traditional school of the Ming dynasty. Since the establishment of the new regime, the Shunzhi emperor had proclaimed the employment of the new European method, which had been in use for over twenty years and had yielded good results. In Verbiest’s opinion, progress comes from long and careful studies. The longer the studies, the more perfect will be the science of the calendar. Yang Guangxian, however, esteemed the old method and belittled the new one. As the result of his maliciousness eight members of the Imperial Observatory had lost their lives. Yang Guangxian cared only for the principles of calendar making and ignored the practical side. To this Verbiest retorts that to show the validity of the principles one must see them in practice. Wrong principles can never give good results. The disgrace of Yang Guangxian before the Kangxi emperor and his ministers through the failure of his experiments clearly showed that he was ignorant of the principles of calendar making. Finally, Verbiest concludes that although justice had been done in the case of Yang Guangxian, the damage done by Yang’s books still remained. For this reason he still wished to publish his work as a defense of the truth.--Cf. Albert Chan, Chinese Books and Documents in the Jesuit Archives in Rome, pp. 344-346.

For full bibliographic citation see Ad Dudink & Nicolas Standaert, Chinese Christian Texts Database (CCT-Database).

Note: A refutation of Yang Guangxian's Budeyi 不得已, an attack on the teachings of the Catholic Church and the motives of the missioners in China. Buglio [et al] refute Yang on a point-by-point basis.

N.B. Description refers to Jap-Sin I, 90
Budeyi bian [Pu te i pien] 不得已辯
By Li Leisi 利類思 (Lodovico Buglio).
One juan, Chinese bamboo paper in one volume. No date or place of publication.

The cover bears a Latin inscription: “Refutatio persecutoris Yam quam sien circa res fidei a p. Lud. Buglio, S.J.”

Note: A refutation of Yang Guangxian's Budeyi 不得已, an attack on the teachings of the Catholic Church and the motives of the missioners in China. Buglio [et al] refute Yang on a point-by-point basis.

明末清初耶穌會思想文獻匯編 = An expository collection of the Christian philosophical works between the end of the Ming dynasty and the beginning of the Qing dynasty in China ; 第17冊.

Local access dig.pdf. in folder: [Andrew Chung Series].

"Buglio quotes and refutes 33 statements from the Pixie lun 闢邪論 of Yang Guangxian 楊光先 (contained in his Budeyi 不得已)."
Full bibliographic citations see: Ad Dudink & Nicolas Standaert, Chinese Christian Texts Database (CCT-Database)

JapSin I, 90
Budeyi bian 不得已辯.
By Li Leisi 李類思 (Lodovico Buglio).
One juan, Chinese bamboo paper in one volume. No date or place of publication.

The cover bears a Latin inscription: “Refutatio persecutoris Yam quam sien circa res fidei a p. Lud. Buglio, S.J.”

JapSin I, 90a
This is the same edition as Jap-Sin I, 90.
Source: Albert Chan, S.J., Chinese Books and Documents in the Jesuit Archives in Rome, p. 145.

JapSin I, 91
This is the same edition as Jap-Sin I, 90 and Jap-Sin I, 90a. One folio is missing from the preface. Romanizations are written on some of the folios.
Source: Albert Chan, S.J., Chinese Books and Documents in the Jesuit Archives in Rome, p. 145.

JapSin I, 92
Budeyi bian 不得已辨.
By Li Leisi 李類思 (Lodovico Buglio).
No date or place of publication.

This edition differs from the one just mentioned (Jap-Sin I, 90, 90a, and 91). Though it is now bound in one volume, there are signs of its having earlier been in two separated volumes.
The preface is missing. The title is given on the first folio; the character 辨 is used instead of 辯, found in the other edition. Again, in 極西耶穌會士 the character yuan 遠 is substituted for ji 極. In Buglio’s Chinese name the character lei 類 is written [米 + 女 + 頁], as quite commonly appears in the printing of the Ming and Qing books.
There are nine columns in each half folio with twenty characters in each column. The upper middle of the folios does not bear the title of the book and the fish tail does not appear until after folio 5. When it does appear the number of the folio is given under it. The book is incomplete and only fifty-three folios remain. The picture of Shang Tang’s praying for rain is not there.
Comparison with the above mentioned edition shows that there are a number of differences between the two texts (Jap-Sin I, 90 and 92); the following are some of them:

Doc.---Folio---Line--Difference
90---1a---5---歷引天學書
92---1a---5---zhai 摘 instead of yin
90---1a---2---恠誕, 果蠕
92---1a---2---怪誕, 菓蠕
90---1a---7---無恠其出言之舛
92---1a---7---無足為怪
90---1a---9---攷,徹
92---1a---9---考,撒
90---1b---1---拆
92---1b---1---折

Also, the two lines of annotations on folio 1b in Jap-Sin I, 90 do not appear in Jap-Sin I, 92. It seems that Jap-Sin I, 92 is an older edition and that Jap-Sin I, 90 is amended in an attempt to get rid of a number of particles and so make the text more simple for the ordinary readers.
Another difference between the two editions is that Jap-Sin I, 92 does not have the appendix Zhongguo churen bian 中國初人辨, but this omission might be explained by the fact that Jap-Sin I, 92 is an incomplete copy. On the other hand, folio 49 of Jap-Sin I, 92 gives the Tianzhujiao yuezheng 天主教約徵 (Some [clear] proofs of the Catholic doctrine), which is not found in the other edition.

Cf. Pfister, p. 241; Hsü 1949, pp. 235–236; Courant 4984–4991; HHSK 10:1274.
Source: Albert Chan, S.J., Chinese Books and Documents in the Jesuit Archives in Rome, pp. 145-146.