232 PHILOSOPHICAL TRANSACTIONS. [aNNO 1675. 



Structure and parts of several fruits, viz. figs, cherries, grapes, pears, citrons, 

 lemons, oranges, &c. &c. taking notice of the singular apparatus, formed by 

 nature for the sake of the seed, which he calls the foetus and the true compen- 

 dium of a plant, made up of all the principal parts thereof. 



But his observations about galls, and other excrescences and appendages of 

 trees, he reserves for another discourse, shortly noticing, however, that those 

 excrescences are not the wombs, in and by which, trees and other plants produce 

 insects ; but only the nests of the egg cast there by the animal parent, and not 

 at all furnished by the plant itself. 



Concerning the uses of the several parts of plants above described, he offers 

 his opinion, but with great diffidence, acknowledging it difficult not to be mis- 

 taken therein. 



Thus far respecting this author*s anatomy of plants : touching his appendix of 

 incubated eggs, he therein shows, with what care he has repeated his former 

 observations upon that subject; though he still scruples to determine, which of 

 these two, the heart or the blood, has the priority of existence in the formation 

 of a chick: this only being certain to him, that there may be observed the first 

 lineaments of the chick even before incubation, and that afterwards, by virtue 

 of the incubation, there are first manifested the vertebrae, and the beginnings 

 of the brain and the spinal marrow, together with the wings, and some flesh ; 

 the heart, vessels, and blood, yet lying then concealed: but yet, because that 

 some rivulets do appear in the umbilical area, he thinks it probable, that the 

 heart is then also appendant to the carina of the chick, he having seen the heart 

 before the 30th hour : but it is a considerable time, he says, before the liquor 

 passes through the heart and the vessels ; which liquor he has observed to be first 

 of a yellowish, then of a ruddy, and at last of a blood-red colour. Whence he 

 a^ain offers his conjecture, that the liquor, the vessels and the heart do exist 

 before the blood. 



II. Epistola ad D. Joelem Langelotum de Alcali et Acidi Insufficientia ad 

 gerendum munus Principiorum Corporum naturalium: Conscripta a Job. Bohn, 

 Phil. etMed. D. in Acad. Lipsiensi. Lip. Anno 1675, in 8vo. 



A chemical dissertation to disprove (what none will now maintain) the suffici- 

 ency of that doctrine, which ascribes the production of the principal phasnomena 

 in nature to the congress and conflict of two principles, an acid and an alkali. 



III. Zymologia Chymica, or a Philosophical Discourse of Fermentation, 

 from a New Hypothesis of Acidum and Sulphur; with an additional Discourse 

 of the Sulphur Bath at Knaresbrough : by W. Sympson, M. D. Lond. 1675, 



in 8vo. 



In the chemical writings of Dr. Sympson, we have before had occasion to 



