[Illustration: PLATE 30.
A. B. BALFOUR DEL.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 31.
F. M. BALFOUR DEL.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 32.
F. M. BALFOUR del
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 33.
F. M. BALFOUR, DEL.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 34.
W. K. P. & W. N. P. DEL. AD NAT.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 35.
W. N. P. del ad nat.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 36.
W. N. P. del. ad nat.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 37.
W. N. P. del ad nat.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 38.
W. N. P., & E. M. B. del. ad nat.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 39.
F. M. B., W. N. P. & M. P. P. DEL. AD NAT.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 40.
W. N. P. & A. C. H. DEL AD NAT.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 41.
F. M. B. & W. N. P. del. ad nat.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 42.
W. N. P. & M P P. del. ad nat.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 43.
F. DEIGHTON del.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 44.
F. DEIGHTON del.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 45.
F. DEIGHTON DEL.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 46.
A. B. BALFOUR DEL.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 47.
A. B. BALFOUR, DEL.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 48.
A. B. BALFOUR DEL.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 49.
M. P. PARKER DEL.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 50.
M. P. PARKER del.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 51.
A. B. BALFOUR & M. P. PARKER DEL.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 52.
F. M. &. A. B. BALFOUR DEL.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]
[Illustration: PLATE 53.
F. M. &. A. B. BALFOUR DEL.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY.]