188 
INDEX. 
Page 
Pigeons, rapidity of flight of. 20, 21 
Plymouth epidemic, 120 pollination of orchard fruits . 10 
Pollock, J. B. 5 
Pollution of Michigan streams . 119-121 
Pollution of St. Louis, Mo., water supply. 122 
Prairie chicken, migration of. 17 
President of Michigan Academy of Science . 5 
Pseudomonas radicicola . 147 
Purple martin, migration of ... 16 
Purification of municipal water supplies . 122 
Quercus, mycorhiza on roots of . 32 
Reduction of rainfall determined by grouped stations of reference. 87 
Richardson’s grouse, migration of . 17 
River, birds found on . 167 
Robin, almost exterminated . 22 
Rock wells . 99 
Russell, I. C., paper by . 128-136 
Rainfall discrepancies within the city of New Orleans. 88 
Rainfall map for Great Lakes by weather bureau. 88 
of Michigan by Michigan Climatic Service .. 89 
Rainfall of Great Lakes . 78 
Rainfall heavy southeast of lakes . 85, 86 
Rain on the lakes when cyclones go south . 89 
Rainfall heavier in lee of elevations . 85 
Rain that originates on the lakes . 86 
Rain water, discussion of . 131 ) 132 
Sackett, W. G., paper by .'. ’ 147 
Salinity of underground water ... 102 
Sand filtration . 123-125 
Sanitary condition of Great Lakes . 101,115 
inland lakes .....114,134,135 
Michigan water supplies . 111-118 
well water . 112,113 
streams .115,134,135 
springs, cistern water, and artesian water . 116 
Sault Ste. Marie water supply . 101 
Secretary-treasurer, Michigan Academy of Science . 5 
Secretary-treasurer’s report . 9 
Sewage filtration, Lawrence, Mass. 125 
Sir John Murray, analyses by . 129 
Slush . 103 
Smith, C. D., paper by . 67 
Snowbirds destroyed by blizzard . 23,24 
Source of rain in the United States.. 86 
Species of migrating birds . 156 
Spirochaeta obermeiri, flagellum staining of . 145 
Sphaeropsis malorum . 40 
Springs . 99 
Starch, production of . 40 
Stimuli to production of starch and cellulose . 40 
Stomata, none in didymaria. 45 
Study of the birds of the overflow east of Ann Arbor by R. A. Brown. 162 
Succession of birds and forests . 157 
Sulphuretted hydrogen . 103 
Swallows, hibernation of . 14 
rapidity of flight of . 21 
Thickets, birds found in 
166 
