72 BOTANICAL GAZETTE. 



exposure of nearly two hoar-; to a cold of - 110°, derived from a 

 mixture of sulphuric ether and solid carbonic acid. 



E. Pkillieux finds that the effect of warmth in the earth is to 

 cause a hypertrophy of the interior of the stem in a young plant ; 

 when closely examined this is found to be accompanied by multi- 

 plication of the cell nuclei. 



D. H. Scott, investigating the structure and development of lat- 

 iciferous vessels, finds that they are developed from rows of cells, 

 the transverse walls of which have been gradually absorbed, and. 

 when two vessels lie side by side, the lateral walls also partially. 

 The resorption usually takes place at an early period; in seedlings 

 during the first stages of germination; in the secondary cortex 

 shortly after the cells in question have separated from the cambi- 

 um. The connection between distant laticiferous vessels is brought 

 about in two ways; either by rows of cells that run transverse'y 

 coalescing with each other, or by protuberances Avhich unite m 

 their growth, and which finally form canals similar to tho^e of the 

 Conjugate. Even before the first septa are absorbed, the cells are 

 characterized by special contents, of which latex is probably a con- 

 stituent. 



A Curious Growth of Coreopsis. — Late in the summer of 

 1873 I observed a remarkable growth of Coreopsis, apparently C. 

 rliscoidea, though the plants were so dwarfed and the floral organs 

 so imperfectly developed that I name the species with much hesi- 

 tancy. 



in what is known as the "Big Woods," eight miles southwest 

 of this place ( Wheaton College, DuPage County, Illinois), there oc- 

 cur ponds or swamps, with no natural outlet, and bottoms of tena- 

 cious brick clay subsoil, several feet in thickness. These mud po 

 or swamps are filled up by the winter and spring rains, but dry out 

 in midsummer. The plants of which I am speaking grew two feet 

 above the ground on the steins of Ceph ilanthus bushes, which wore 

 standing inoneofthosedried-oul ponds. Long, slender roots (resemb- 

 ling the stems or Dodder), followed closely the fissures of the Cepli- 

 alanthus bark down to r,he soil where they develop normally, thus 

 connecting by a slender thread, as it were, the tuft of green herbage 

 ab >ve with the moisture supplying e irth below. The best d ■ v dop- 

 ed plants were found highest up, though all were nearly on the 

 same "horizon." Lower down I could see undeveloped seeds stick- 

 ing to the hark, some of which had sprouted but failed to grow, ap- 

 parently for want of moisture. 



It seems most likely that the seeds floating on the surface of the 

 water during i ison of floods collected around the bushes; that the 

 water remain sd standing until the time of their germination, and 



l be : »wly subside, and thus the roots following this re- 



treating source of moisture-supply were led down to the ground. 



The plants, as befor L, ire very much dwarfed, 4 to 6 



