GLOSSARY. 251 



refract the light to a focus, or causing the rays to di- 

 verge. 



Leucocytes. "White cells, whether in blood or elsewhere. 

 They are simply masses of bioplasm. 



Luteine Spectra. The spectra produced by light passing 

 through juice from the corpora lutea in the ovary. 



Metamorphosis. Change of form, as from the caterpil- 

 lar to the butterfly. 



Metric Measure. The system first adopted in France, 

 based on the metre, which is the ten millionth of the 

 quadrant of the meridian of Paris. The unit of surface 

 is the arc of one hundred square metres. The unit of 

 weight is the gramme, weighing TTJ l uo th of a cubic 

 metre of water. The multiples are indicated by Greek 

 prefixes, deca (10), hecto (100), kilo (1000), myrio (10,000). 

 The subdivisions are named by Latin prefixes, deci, centi, 

 arid milli. 



Micro-gonidia. Bodies resulting from the segmentation 

 of motile cells in the lower order of vegetables. When 

 possessing active movement they rank as zoospores. 



Micrometer. An instrument for measuring minute 

 spaces. 



Microscopy. The use of the microscope, and the knowl- 

 edge attained by it. 



Microzymes. Minute molecules found in the vaccine 

 vesicles, glanders, and other disease products. 



Molecular Coalescence. A name given to the action of 

 various chemical substances, in a nascent state, upon an 

 organic colloid. 



Monera. The name given by Professor Hackel to the 

 simplest forms of animal life. 



Morphology. The science of form. Applied to the 

 structures of organized beings. 



Motile Cells. Minute vegetable cells, moving by means 

 of vibratile cilia. After a time they lose their cilia and 

 become still cells, which multiply by self-division. 



