ERRATA. 



Page ii, 4th line from bottom, for " on " read " in." 

 " 17, 8th line from bottom, for "juxtaposition" read 

 " contradistinction." 

 30, 10th line, for " through " read " from." 

 39, 2nd line from bottom, for "0.6 " read " 0.6 per 



cent." 

 41, 7th line from bottom, for " protozoa" read " pro- 

 tozoan." 

 53, 24th line, for " converts " read " covers." 



55, 14th line from bottom, for " Heneguy " read 

 " Henneguy." 



56, 1st line, after "la Valette " insert "St. 

 George." 



56, 19th line, after " used " insert an." 

 63, for " mm." after measurements read " /*." 

 65, 10th line from bottom, for " Vallette " read 

 "Valette." 



