Dendro ica vigorsii . 
Concord, Mass. Nest-building. 
1898. Early in the forenoon a female Pine Warbler visited the 
Lay 15. cabin ajnumber of times for nest building material which she 
obtained by hopping about on the 'ground close to our door. 
Gilbert traced her to the tall white pines on the bach of the 
hill but he failed to find the nest. He says that the male 
remained singing in these pines the whole time never once ac- 
companying his mate on her trips after material. 
May 7. Under the pines on Benson' s ridge Bartlett picked up a 
remarkably beautiful nest of the Pine Warbler lined with feath- 
ers and the fur of a Gray Squirrel. The materials were abso- 
lute!;/ fresh, clean and not in the least matted. I think the 
nest must have been a new one but 1 tis an early date. 
C am.br i dge , Ma s s . 
lOSS . A bird that I have never before noted in Cambridge during 
June 18. the breeding season was a Pine Warbler that was singing in 
the white pine grove at Elmwood as I drove down Brattle Street 
on my way home this morning. 
Concord, Mass. 
Oct. 3. A Pine Warbler was in full song on Ball's Hill at 10 A.M. 
1898. 
and 2 P.M. 
Oct ,4, Two singing feebly at Ball's Hill at noon. 
