Violin: 

Fiorello mm 15-20

Rode - 3 pickup notes into 24 (last 3 notes of mm 23/open D) - 1st note of 61

Viola:  

Campagnoli mm 1 - 12

Mazas - mm 27 -  1st note of mm 41

Cello: 

Popper - mm 24 - 1st note of mm 33

Merk - pickup to measure 9 - half note of mm 28

Bass: 

Simandl - mm 1-40

Storch - mm 62 - the end