I am reading through The Bread Bible another fantastic book by Rose [is there anything that she can’t do] and I don’t have instant yeast on hand can I substitute active yeast.  If so, what are the proportions.
Thanks.

The information is right there in the BB.  Look up yeast in the ingredient section in the back of the book.

Page 562 of the Bread Bible:

To convert recipes calling for instant yeast to active dry yeast:  Use 1.25 times the weight; or, for 1 teaspoon instant yeast, use about 1 1/4 teaspoons active dry yeast.

To convert recipes calling for active dry yeast to instant yeast:  Use 0.67 times the weight; or, for 1 teaspoon active dry yeast, use 3/4 teaspoon instant yeast.

To Convert recipes calling for fresh compressed yeast to instant yeast:  Use 0.32 times the weight; or, for 1 packed tablespoon (21 grams) fresh yeast, use 2 teaspoons instant yeast.

Page 443 of the Cake Bible:
For 0.25-ounce package of active dry yeast, substitute 1 packed tablespoon (0.75 ounce) compressed fresh yeast

For 1 packed tablespoon (0.75 ounce) compressed fresh yeast, substitute 1 packed tablespoon plus 1 packed teaspoon (1 ounce) thawed frozen compressed fresh yeast

Note:

1 package of active dry yeast = 2 1/4 teaspoons = .25 ounce = 7 grams.

1 package of compressed fresh yeast = .6 ounce = 17 grams.

If recipe calls for dry yeast, x 2.42 is amount of fresh yeast needed.

If recipe calls for fresh yeast, x .41 is amount of dry yeast needed.

Using volume, you need 1.4 times the volume of packed fresh yeast to replace dry.