11? THE AMERICAN BOTANIST. 



some regions has shown more than a hundred seedHngs to 

 the square inch. All these desert annuals are noticeable for 

 the rapidity with which they develop. This is doubtless due 

 to the fact that they are the descendants of a long line of 

 plants which have time and again had it forced upon them that 

 they must ripen their seeds before the precious moisture in the 

 soil has disappeared. The seeds, too, seem to understand some- 

 thing of this, and in years when, for one cause or another, the 

 rains are scanty, they do not grow at all but lie in the soil until 

 another year of greater rainfall. 



Hybrids and Variations. — The prominence given these 

 subjects at present makes the following list of titles of articles 

 published in this magazine of interest. The number preceding 

 the colon indicates the volume and the other the page. Hy- 

 bridizing plants 6:111. violet hybrids 7:117, 12:11, wild hy- 

 brids 12 :16, Hybrid lobelias 5 :101, Asplenium ebenoides a 

 hybrid 3 :51, crossing orchid genera 5 :37. The citrange, tan- 

 gelo and plumcot, 5:119, variation in pecan, 2:57, variation in 

 round leaves orchid 7 :55, variation in plants 3 :48, variation in 

 common polypody 5 :55, elementary species 8 :97, making new 

 species 10:17. Making a new variety 9:73. Possibilities of 

 species-making 11:21, the interpretation of species 10:117. 

 The American hop trees 11 :43, more extinct species 3 :52, 

 9:15. Species of varieties 4:74, origin of species by muta- 

 tion 3 :26, new species of plants 7 :111. Cinamon fern fruiting 

 in Autumn 2 :44. Two forms of Virginia creeper 3 :35. For- 

 mation of leaves in water 3 :35. Varying size of Jack- 

 in-the-pulpit 9 :73, Variation in toad flax 12:43. A large 

 Arisaema 11 :40. A large head of sunflower 11 :88. Single 

 volumes may be had for 50 cents each or for 40 cents when 

 ordered with a year's subscription. The numbers are not sold 

 singly. See advertising pages for complete sets and other 

 numbers for different lists of titles. 



