145 



in Baule Lake. This material is so nbundaut tliat it sives the lake wafer a 

 decided amber color, and the rays of the sun penetrating into the water 

 make streaks much like those formed by sunlight entering into a very 

 dusty itjom, or dusty atmosphere, as in the phenomenon commonly si>oken 

 of as the "sun drawing water." It is very certain that tliis material cuts 

 off a great deal of light, and perhaps absorbs considerable of plant food. 

 At any rate,' there seems to be an interference of some sort 1>etween tlie 

 larger plants and the plankton— a fact generally observed. (See a reference 

 to this: relation, part 5, page 257, of Science. Vol. XI. No. 208.) 



THE LAKE ALGAE.— No particular attention was paid to the Algae 

 except whei'e they formed conspicuous masses. ]VIost of the work in this 

 group was left to the investigators in plankton. Oedo(ioiiiiinu CladopJiera 

 nndS pifOffiira eonld be found almost any time in the ditches :uid along the 

 edges: lOf the < lake. 



.i I rnn-oughou*' both' summers of the work. 1899 and 19CK1. Mougentin was 

 very abundant in the lake, especially in the head bay. Much of it formed 

 immense clouiSy patches among the water weeds, and much of it was in the 

 shape ' of I lairge;' floating, yellowish gi-een patches. Thei"e v\trs a gdod de&l 

 ofi Rin/tmi-ht in the lake. All I saw here was attached. It gi-ew in a semi- 

 globulaTT' forikjiyfasteued to water weeds and rushes. Ui>on rich, muddy 

 bottom, where there is an abundance of dead bits of Scirpus. there is a good 

 deal ift^iC'//«!<?rr)p/mm.which assumes the form of a narrow, elongated, dichot- 

 omonslyilirauching- thallns. which resembles some of the narrow f'irciofi in 

 ontwai'd>'aspecli 'The water is full of fine granular masses of Glathr6cy$tis, 

 and I short, eteuti • rigid filamentB of Oscillana. which resemble hail" clip- 

 pings. ^ Bydrotiii^ttmi'isi very peculiai^ in its occuiTence in the lake. It%id- 

 denly appeal's' in' great mas-ses at the mouth of Clieriy Creek, and 'then, 

 after remaining a few' days; it 'ife' washed in great masses nponfllel shore 

 and isoiddenly 'disappears, generally after reproduction, go tWat aftef the 

 large plants have disappeared the water is full of very tiny oneSs. '■■1%e 

 date <5f*-appeartt4ice of this^ plant in 1900 ^as-'Jidy fSA By Jnly 27^ dil the 

 older Hi^mfM&ff/oH h^ii disappeared as a! flaftss' and tlie wat^ was^ fiiU «if 

 young pJaotJsi!':- '• '-^ ?' ■" '-■'-••■ 'n;!^ vtiiiiii ■.^>d)i^■i s-no-r^ li 



Many»!lai^g<*<'^^<<»S<otMJike jelly masises'-cif afii'^iisicelhilaa' alga; pt-obably 

 Aiphfvnoth>6m!''^^re found along the hortheiT5 shore of the West b^y. 

 ■Among other ';a'lgiae noted in considerable masses w'as MiorotJwmnion. 

 Thieire Avas atso a ffeiw! plants of a small momiliform species of WiUU&'toxitiQ 



