57 
expeditions to Florida and Porto Rico. Fifteen of the museum 
cases are now devoted to this display. So far as is practicable, 
it has been the design to illustrate each of the species chosen to 
the aid of a solution of formaldehyde aa She in a museum 
jar, and by a plate or figures illustrating the ae of the 
plant or its appearance under magnification. 
Fic. 9. Caulerpa racemosa ‘laetevirens (Mont.) Web.-v. Bosse. From Bermuda. 
About one fourth natural size. ) 
The first case of the series is occupied by representatives of 
the blue-green algae, as they are often called, and the diatoms. 
The plants of these two groups are minute, so much so that in 
most cases the individuals can be well seen only with the aid of 
a microscope. As one finds them in nature they commonly 
form slimy or oozy masses which are not particularly attractive 
to the naked eye, but under a compound microscope are of very 
great interest. The photo-micrographs and detailed enlarge- 
