916 JOURNAL OF FORESTRY 



to agricultural production, is the comparatively dry winter and the 

 main rainfall in late spring and early summer, culminating in June. 

 The type curve rises from slightly above i inch in a constant line to 

 June with over 4 inches, then as gradually sinking to i inch in 

 December. 



Within this type four or five subtypes are segregated ; in the terri- 

 tory around the Upper Lakes a second maximum in September appears. 

 The Ohio type delays the maximum till July, and has considerably 

 wetter winters — more often rain than snow. The New England type 

 is rather difficult to recognize as related to the main Missouri type, 

 for it shows an even precipitation through the year, wavering between 

 3 and 4 inches ; maxima and minima can hardly be spoken of, although 

 a slight maximum may be recognized in August. 



The South Atlantic type, however, again conforms more to the main 

 type, in that it has a decided maximum in July and August, but addi- 

 tional minima in April and November. 



Another peculiar type which it is difficult to range under the Mis- 

 souri is the Tennessee type, with maxima in winter (March) and min- 

 imum in October. Here drouths are not infrequent in the autumn. 

 There is danger of the heavy winter and spring rains to cause floods. 



The Gulf province is too complex to bring into one type, owing to 

 frequency of thunderstorms and local cyclonic depressions and West 

 Indian hurricanes. The Florida type is distinctly tropical, with a rainy 

 season from June to September, a faint secondary maximum in Feb- 

 ruary, and minima in April and November. 



The North Gulf Coast type curve appears to us to resemble quite 

 closely to the Florida type, but the author compares it to the Tennessee 

 and Atlantic types. The Texas Coast type is markedly different from the 

 other coast types, showing a more uniform distribution of rainfall, with 

 a decided maximum in September and a minor one in June, the min- 

 imum extending from December to April uniformly. 



Toward the Rocky Mountains the Missouri type, which is charac- 

 teristic of the whole Northern Plains province, experiences modifica- 

 tions into the Eastern Rocky Mountain Foothills type, which, with 

 about half the mean annual rainfall, shows its maximum a month 

 earlier, but otherwise conforms to the character of the main type curve. 



To the south of this subtype another subtype, the New Mexican, is 

 modified from the Missouri type, with a dry winter and a well-marked 

 mid or late summer rainfall maximum (July- August), altogether drier 

 than the main type. 



