VOL. VII.] PHILOSOPHICAL TKANSACTIONS. 7 



advantage of this doctrine, and its happiness in explaining many phacnomena, 

 hardly explicable without it ; such as the production of more foetuses than one ; 

 the production of monsters: the many odd symptoms in women, from the pu- 

 trcfuction or imperfect constitution of the egg or eggs; the production of 

 molas; barrenness, &c. Having dispatched this, he takes occasion to examine 

 the question, an fieri conceptio possit extra utcrum? ubi nonnuUa disseruntur 

 de homunculo chymico sive paracelsico; quae apud ipsum vide authorem. 



IV. A short and sure Guide in the Practice of raising and ordering of Fruit- 

 trees; by Francis Drope, B.D. late Fellow of Magdalen College in Oxford. 

 Oxford, 1672. 



This piece appears by the preface to have been written from the author's own 

 experience. The particulars insisted on in this discourse are principally: 1. Of 

 raising stocks from the seed. 2. Of the nursery. 3. Of grafting. 4. Of ia- 

 noculating of stocks raised without seed, and trees without incision. 



j4n Extract of a Latin Epistle of Dr. Joel Langelot, Chief PhyHcian to the 

 Duke of Holstein now Regent ; wherein is represented, that by these three 

 Chemical Operations, Digestion, Fermentation, and Triture, or Grinding 

 (hitherto, in the Author's Opinion, not siifficiently regarded) many Things of 

 admirable use may be performed. Translated by Mr. Oldenburg. N° 87, 

 p. 5052. 



It is sufficient to give the title of this long alchemical paper, without making 

 any extract from it. Philosophers can employ their time better in these days, 

 than by reading accounts of experiments said to yield results not reconcilable 

 with the known and immutable properties of natural bodies. 



An Extract of a Letter from Mr. Lister to the Editor, both enlarging and cor^ 

 reeling his former Notes about Kermes; arid insinuating his Conjecture of 

 Cochineal being a Sort of Kermes. N° 87, p. 5059. 



We must correct as well as enlarge our notes concerning kermes.* These 

 things are certain : 



] . That we have this year seen the very gum of the apricot and cherr}'- laurel 

 trees transudated, at least standing in a crystal drop upon some (though very 

 rarely) of the tops of these kermes. 2. That they change colour from a yellow 

 to a dark brown ; that they seem to be distended and to wax greater, and from 

 soft to become brittle. 3. That they are filled with a sort of mites ; that small 



* Compare herewith what was published in Nos. 7l> 72, and 73. 



