370 ANNUAL RECORD OE SCIENCE AND INDUSTRY. 



mcnted in volume, and at the end of five days the frustules 

 were half filled, and the characteristic yellow tint of the en- 

 dochrome appeared ; on the eighth day the revivification was 

 complete, and soon after they began their curious motions, 

 and the multiplication by division [Journal de Micrographie, 

 Dec, 1877). 



In connection with the above, Mr. Fred. Ilabirshaw, of 

 New York, states that in 1871 Capt. Mortimer brought from 

 San Francisco, in his ship, a large bottle of diatoms (from 

 fresh water). When he arrived in England they were still 

 alive, but afterwards dried up, and remained in that state in 

 his cabin until the summer of 1877 a period of six years. 

 "Having found the old bottle, which we knew very well, we 

 refilled it with water, and on examining it several days later 

 we found some living specimens in it." 



That living diatoms were found as stated there can be no 

 doubt, but that they were revivified yet needs proof. It is 

 contrary to experience hitherto; indeed, it is well known, and 

 one of the means employed to procure purer gatherings, that 

 oftentimes apparently pure water will, if allowed to stand 

 quietly, show an abundant crop of diatoms. In many cases 

 that we have noted of the appearance of living diatoms, after 

 wetting long- dried material, they have been, not the forms 

 originally in the gathering, but those evidently derived from 

 the water. Just at present, while we may nay, perhaps 

 must, admit that, up to a certain limit, diatoms, like the roti- 

 fers, may be dried, with power of revivification or reproduc- 

 tion, there is yet lacking sufficient evidence that tins drying 

 may extend over a series of years. 



Parasites on a Diatom. 



31. Guimard, while observing a gathering of diatoms, most- 

 ly Pinnulariecv, saw great numbers of them covered by small 

 bodies of a yellowish -brown color, and moving with great 

 rapidity. With a No. 5 of Nachet, they were seen to have 

 a rectangular body, and contained in their interior a yellow- 

 ish-brown matter, with globules of a deeper color, and re- 

 sembling the ordinary endochrome of the diatoms; at each 

 of the four angles was a long hyaline arm, of great mobility. 

 Seen in profile, the body presented the form of an elongated 

 oval [Bulletin de la Societe Beige de Micf08C0pie,v6\. iv., p. 304). 





