174 ON THE DEVELOPMENT OF THE ANIMAL TISSUES^ 



found fatty globules with blood- globules, when they are mixed, as is 

 frequently seen in the body ? It it is thus that in a woman, who died 

 of erysipelas of the face, I found that the blood contained in the 

 veins of this part, offered a great number of small fatty globules, 

 which were readily recognisable by the property they possessed of 

 refracting light, and by their greasing the surface of the slide on which 

 they were placed ; they did not dissolve when the breath was directed 

 upon them, whilst the globules of blood rapidly disappeared when so 

 treated. 



From the facts I have related, I consider I am authorised in stating, 

 that the globules of the blood have no central nucleus, but are composed of 

 corpuscules or small homogeneous masses completely soluble in water. 



[We have repeated the experiment above alluded to, but do not rest 

 altogether satisfied with the results obtained by Dr. Lambotte. We 

 do not question the enlargement and rupture of the blood- corpuscles 

 by endosmosis, which evidently takes place when blood is so treated. 

 As Dr. L. used a single lens of such high power, probably the trans- 

 parent envelopes of the corpuscles could not be seen to such advantage 

 as when they are viewed with a compound microscope, and with powers 

 of acknowledged achromatic superiority. Our apology for inserting the 

 above communication entire, must be the desire we entertain of record- 

 ing the labours of Continental observers.] 



XXX. ON THE DEVELOPEMENT OF THE ANIMAL TISSUES. 



By Professor Mutter. 

 [Continued from page 83.] 



CLASS III. 1. Cartilages. Their structure and mode of development 

 has already been described, (see page 80). 



2. The Teeth. The enamel of a tooth not yet fully formed retains 

 the same form and structure after it has been treated with dilute acid. 

 The inner surface of the enamel membrane which envelopes the crown 

 of the tooth is formed of short hexagonal fibres, placed perpendicularly, 

 so that each fibre of the enamel membrane corresponds to a fibre of the 

 enamel. These fibres of the enamel membrane appear to be elongated 

 cells. In the fresh state they contain a nucleus with nucleoli. Beneath 

 these prismatic fibres of the enamel membrane is a layer of round cells 

 which probably represent the primary condition of those fibres. The 



