CELLS. 



43 



albumen and chloroform, serum-casein and fat, chondrin and chloro- 

 form, albuminous, casein, and chondrin membranes are formed, as 

 Panum observed (see in part, ' Archiv f. Path. Anatomic,' iv. 2), it can 

 hardly be permissible to assume any chemical action. 



II. OF THE CELLS. 



7. The cells, cellulce, called also elementary cells, or nucleated cells, 

 are perfectly closed vesicles of 0-005 0-01 of a Paris line,* in mean 



* [The measurements employed by Prof. Kolliker are, according to the old French 

 standard, of inches and lines. In the original work a line is expressed by '", an inch by ". 

 As these signs are not used in this country, I have, in every instance, substituted the 

 words for the signs. Most English and American authors express the size of objects in 

 fractions of an inch, but rarely in lines. The English inch and line differ but little from 

 the Paris inch and line. The old Paris inch (") was divided into 12 lines ('") ; one line 

 being equal to g s ff ths, or rather more than the llth of an English inch : hence the difference 

 between a Paris line and an English line is very slight; s^th of an English line being 

 equal to ^^d of a Paris line; an English inch is thus exactly 11-26 Paris lines. All the 

 French and many of the continental microscopists employ the recent French measure- 

 ments: the centimetre and millimetre. The proportion they bear to the English and French 

 inch is as follows: one millimetre ( mm ) is equal to 0-03937, or about ^jjth of an English 

 inch, or to ^d of a Paris line. The subjoined table of the main measurements, noted 

 throughout the work in lines, reduced to fractions of an English inch, and parts of millime- 

 tres, will aid the student in forming a comparative estimate of the size of objects, as 

 measured by observers in different countries : 



TABLE OF MEASUREMENTS. 



DAC.] 



