By CORROSION. 383 
‘the joinings of the pieces of the mould, which being en- 
‘tirely repaired, we then colour the different parts which 
compofe the piece with colours fuitable to each part, that 
the arteries may be coloured with vermillion ; the veins 
with Pruffian blue; the mufcles with carmine; and fo of 
the other parts; which fini/hes the preparation. 
‘¢ Note, When we with to make the wax lefs brittle, we 
muft add fome f{permaceti to it; and fometimes a little of 
the fineft Venice turpentine that can be procured.” 
fus les portions éxcedentes de cire qui fe font glifsées entre les jointures des pieces du moule. 
La piece etant entierement reparée, on colore les differentes parties qui compofent la piece 
avec des couleurs convenables a chaque partie, en forte que les arteres feront colorées avec du 
vermillon; et les veines avec du bleu de Pruffe; les mufcles avec du carmin; ainfi des autres. 
‘Nota que quand on veut rendre la cire moins caffante on y adjoute le blanc de baleine, 
-guelque fois aufli un peu de terebentine de Venife, tout ce qu’il y a de plus fin. 
N° XLII 
Of a living Snake in a living Horfe’s Eye, and of other 
unufual Productions of Animals. By Joun Morcan, 
M. D. F. R. S. London, Profeffor of the Theory and 
Prattice of Phyfic, Philadelphia. 
Read June HETHER there is fuch a thing in nature 
Spat as equivocal generation, by which is to be 
underftood the produétion of any new animal indepen- 
dant of a parent ftock of the fame kind, has been a fub- 
jet of controverfy amongft philofophers; fome afferting 
the reality of this doctrine, whilft others, as the celebrat- 
ed Harvey and his followers as ftrenuoufly reje@ it. The 
Jatter, which is now deemed the orthodox fide of the 
queftion, affirm that the young of all are produced from 
an egg, furnifhed by the female, and foecundated by a male 
animal. From the light thrown upon this fubjeét, by the 
deep refearches of Hippocrates, Galen and Ariftotle, 
Cicer 2 among 
