THE AMERICAN 
MONTHLY 
MICROSCOPICAL JOURNAL. 
Entered at the post-office as second-class matter. 
VOL. XXII. SEPTEMBEI, 1901, NO. 9. 
CONTENTS. 
Protoplasmic Currents and Vital Force. Herrera... 237-241 
Colouring of Water by Micro-Organisms. Berroa: 8 86 ic: 241-245 
eee lOO Af) RIGA ANG DiSCASC i receceeececcce 245-250 
Review of the Microscope and its Revelations... 250-251 
EXTRACTS FROM POSTAL MICROSCOPICAL SOCIETY’S NoTE 
BookKs.—Development of Gratis eecceecceeseeeeees 252-255 
Notes By M.I. Cross. Drawing with the Camera Lucida ; 
Colour-Photo-Micrography ; to View Multiplied Images .... 255-258 
NoTES BY SHILLINGTON SCALES.—Royal Microscopical So- 
Os DRAB Se SBE nA RR ay ee 258-260 
NEw PUBLICATIONS.—Microscopical Analysis of Drug Pow- 
ders; Sanitary Investigations of the Illinois River... »= 261-262 
<—e 
Protoplasmic Currents and Vital Force. 
PROF. A. lL. HERRERA, M.S. A. 
I have lately stated that some currents of granules 
may lead to the formation of a pseudopodium in my syn- 
thetic protoplasm observed under the microscope.* What 
occurs, however, is an exact imitation of the natural phe- 
nomenon, The internal energy of the said currents ex- 
pends itself in external movements. The fluid loaded 
with granulations strikes, as it were, a blow as it dashes 
against the endosarc, or the limiting membrane of the 
protoplasm, and pushes it outwards. | 
But these currents play a more important part; they 
induce, indeed, the following processes: — 
* Natural Science, August 1898; Bull. Soc. Zool, France, 1898, p. 
119; American Naturalist, December 1898. 
