APPENDIX. 



TABLE OP THE DEVELOPMENT OP AN EMBRYO. 

 (Modified from Gray's Anatomy.} 



1st Week. Ovum in Fallopian tube. Segmentation of vitellus. 



2d Week. Ovum in uterine decidua. Chorion. Formation of blasto- 

 derm and division of mesoderm. Heart and medullary groove. Amnion 

 and umbilical vesicle formed. Allantois. 



3d Week. Head and tail flexures. Closure of medullary canal, and 

 formation of primary cerebral vesicles and ocular and auditory vesicles. 

 Branchial arches. Wplffian bodies. Limbs. 



4th Week. Limbs increased. Anal opening. Interventricular sep- 

 tum begins. Ant. spinal nerve-roots. Olfactory fossae. Lungs. Pleurae. 



5th Week. Allantois vascular. Trace of feet and hands. Miiller's 

 duct and genital gland. 



6th Week. Umbilical vesicle disused. Branchial clefts close. Post- 

 spinal nerve-roots. Membranes of the nervous centres. Bladder. Kid- 

 neys. Tongue. Larynx. 



7th Week. Muscles perceptible. Many centres of ossification appear. 



8th Week. Joints appear in extremities; fingers and toes separate. 

 Crystalline lens. Salivary glands. Spleen. Interventricular septum 

 complete. Sympathetic nerves. 



9th Week. Distinction between ovary and testicle. Genital furrow. 

 Pericardium. 



3d Month. Formation of placenta. External genitals separate from 

 anus. Eyelids, hairs, and nails. Duct of Wolffian body joins testicle. 



4th Month. Middle-ear bones. Tympanum and labyrinth. Scrotum 

 and prepuce. 



5th Month. Germs of teeth. Hair- and sweat-glands. Brunner's 

 glands. Uterus and vagina distinctly separate. 



6th Month. Papillae of skin. Sebaceous glands. Peyer's patches. 

 Free border of nails. 



7th Month. Cerebral convolutions. Pupillary membrane disappears. 



8th Month. Descent of testis. 



9th Month. Opening of eyelids. Ossification of cochlea. 



CHEMICAL TESTS USED COMMONLY IN PHYSIO- 

 LOGICAL ANALYSIS. 

 FOR PROTEIDS : 



Nitric Acid coagulates all except peptones. 



P 205 



