184 THE PLANT WORLD. 



the branches of the same length (10) or of unequal length (11). One hair 

 separated into four a little way from the base (12). Agrostonma bears 

 roots which sometimes have forked hairs. I found two such near each 

 other (13). 



In close proximity, one root of Leonurus bore three unusual forms 

 of hairs as represented in Figure 14. 



Diligent search was made on twenty or more kinds of seedlings 

 for se])tate hairs, and finally a nice lot of them was found on Cheno- 

 podium hyh'idum Z., as shown in Figure (15). 



When root-hairs of wheat or other plants were very slightly dried 

 or exposed to cold, they were seen to collapse a little back of a rather 

 thick apex, as seen in the Figure (16). 



Some df them resemble glove fingers inverted at the apex (17). 



Some germinating wheat on a dinner plate covered by thick felt 

 paper and an inverted plate was left in the laboratory for four or five 

 weeks with very little attention. Nearly all the roots had turned brown 

 and all the hairs had died. Perhaps half a dozen root-tips were slowly 

 moving; forward each bearino- hairs. The contents of hairs found on 

 such roots had usually disappeared, and the tips were much thickened 

 with cellulese, in some instances to such an extent that the thickening 

 was four times as long as the hairs were wide. Figures are given 

 showing a variety of hairs found on such roots. 



1 



AN EXAMPLE OF DEDUCTIVE REASONING. 



By Arthur Hollick. 



N nearly all scientific work two stages of progress may be noted — first 

 the discovery of facts, second the drawing of inferences or conclu- 

 sions from the facts. In some cases the latter remain as mere 

 theories, in others they are verified by subsequent discoveries. It was 

 my good fortune to be connected with an instance of this latter kind, 

 which was not only exceedingly satisfactory in itself, but which was 

 of more than local significance. 



On Staten Island the Terminal Moraine is represented by a series 

 of characteristic rounded hills and basin-like depressions, many of 

 which latter are occupied by ponds or swamps, more or less filled up 

 with sedimentary material, consisting of vegetable debris and inorganic 

 silt, either blown in by the wind or washed in by the rain from the 



