INDEX. 
189 
Turbidity of surface water . 100 
underground water . 103 
Twenty-five years of bird migration at Ann Arbor by N. A. Wood.:.. 151 
Typhoid epidemics . 120 
Typhoid fever at St. Louis, Mo. 127 
Underground water supply . 99 
Unexplained excess of rainfall at Harrisville . 86 
Vaughan, Victor C., paper by .111-118,127 
Vice president Michigan Academy of Science ... ’ 5 
Volunteer meterological observers . 79 
Water supplies, Michigan . m 
Water supplies, purification of. 122 
Water works . 104 , no 
Waves of bird migration . ’ 155 
Wells from drift .99,132-133 
Wheat, proteid contents of, as an index to its bread-making value. 75 
Williams, G. S., paper by .122,126,127 
Woodcock destroyed by blizzard . 24 
Wood, N. A., paper by . 151 
ERRATUM. 
Page 10, line 1, “Eleventh” read “Twelfth.” 
