THE AMERICAN BOTANIST 



147 



then being knoAvn as tubcrosa, just as the florist speaks of 

 American beauty roses as ''beauties" and chrysanthemums as 

 ''mums." Apparently tubcrosa had no meaning to the average 

 gardener and so it grackially came tO' be known as tube-rose — 

 a rose with a tube, as the name is now sometimes translated. 

 The latest dictionaries give authority for either form of the 

 name and so the tuber-ose is slowly becoming a tube-rose, 

 because those who use the word are unfamijar with the Latin. 

 There is a large number of plants w4th common names de- 

 rived from the scientific such as rose, aster, peony, lupine and 

 the like, but cases in which the specific name has given rise 

 to the common name are exceedingly rare. 



Flowers and the Camera. — The amateur photographer 

 with a kodak soon discovers that there is a great difference 

 in the way different flowers affect the sensitized plate or film. 

 White flowers come out clear and distinct, blue and pink 

 flowers are nearly as good and red is not impossible, but 

 when it comes to yellow^ and orange flowers the trouble begins. 

 One may turn the camera on a clump of plants fairly blazing 

 with yellow only to find after the negative has been developed 

 that the flowers can be distinguished from the leaves only 

 with difficulty. To oblige the yellow to- make its mark, one 

 must slip over his lens a ray-filter which sorts out the rays 

 of light and thus produces the desired effect. Many of the 

 yellow flowers among the compositae have another surprise 

 in store for the photographer whose equipment lacks a ray- 

 filter. Some day he photographs a clear yellow composite and 

 when the plate is developed he finds the image of a two col- 

 ored flower. The rays, which appeared to the eye as clear 

 yellow, now show the inner half to hold a darker color. When 

 the color screen, however, is placed over the lens the photo- 

 graph obtained shows no trace of this second color. Evidently 

 the inner half of the rays reflect the light in a way that affects 

 the sensitive surface, though the eye cannot distinguish it. 



