In the year 1695, Cassini undertook a journey to Bo logna in company with his sr.», for the purpose of ex amining the meridian line in the church ol St Pe tronius, which he had drawn in 1655, and he found that it had not sustained any variation in the course of 40 years. Ili 1700, he continued, to the very south of France, the meridian line which Picard had begun, and he published an account (tithe undertaking in the Memoirs of the Aca demy for 1701, under the title of Dc la illeridit nne de l'Observatoire Royale,prolonger jusqu' aux Pyrenees. In the latter pact of his life Cassini lost his sight, and he died without any disease on the 14th of September 1712, at the advanced ate of 87. Ile had lost his eldest son at the battle of La I logne ; and he was succeeded in the observatory and in the /stead, lily by his youngest son, the subject of the following article.
Besides the works which Cassini printed in Italy. and the 165 memoirs on astronomical subjects, Ile puniished the following 11 memoirs Oh general subjects: I. Ob servations sur la illaniere de fitire tie pulls, et des jets d'Eau a Modem., \1 m. Acad. 1666, tom. i. 2. Sur la Balance ..Pahmetique. Id. p. 1•t2. 3. Sur en -ache Progression des tVontbr(s. Id. p. 201. 4. Sur en Eau renfirmie dans en Bowel/le, et qui femol: continu ellement des °toil lr Bouthon. Id. p. 2-12. 5. .Sur la quantite d'Eau necessaire pour faire d'alhr un moulin. Id. p. 286. 6. Sur un Meteore en forme dr Globe
de feu de la grandeur d, In Lune vu en 1687. Id. tom., ii. p. 19. 7. Sum la Figure de la .Ve ige. Id. p. 37. 8. Sur 1'En:1a:on in Vesuve en 169 t. Id. p. 1 27. 9. D- la Figure de la Xiige. Ton). x. p. 25. 1 e. Sur de Pt.rhe lies vues en Janvier 1693. Id. tons. ii. p. 1 3. 11. .S:ir un Balance ?rithmetique. :11ac 1iu. Approuv. Tom. i. p. 143. Cassini also made many observations on insects, adarcssed to M. .Montalbani, who publisi.ed teem in the orks of Aldrovandus. Ile likewise t lade a number of experiments on the of blood.
Cassini published also the fohowing separ.,te works. Nouvelles Observations des Caches in So:td. avec quel ques autres Observations sur la Saturne. Paris. 1671, 91o. Observations et Reflexions SLP la Comete de 1672. Decouvertcs de deux nouvelles Planetes antour de Sa lome. Paris, 1673, fol. Observations et Reflexions sur la Comete de 1680 et 1681. Paris, 1681, 4to. Abu decouvertcs dans lc Globe de Jupiter. Paris, 1790, 9 to.
The following works were left unfinished, or in AIS.
.Aintell Siderei InterJzres. Magna periodus lonisolaris et Paschall& duobus libris comprchensa, quorum prinzus magne perkdi fundanzenta ejusque usum expoizit, alter mum ejus civilem et ecclesiasticum. tine Cosmographic on one description du Monde ; en vers Italien. Tables des Mouvenzeizs die Soleil et de In Lune. (o)